I had pretty close to the same set up. 2500.1dz on a stock 90amp alt @2ohms on a single hdc3.1 12 with a bosch agm under the hood. Set the gain with dd-1 and marked where -5 and -10 were on my volume knob, I mostly play rebassed and hip hop at -10 for 30min 2-4 times a day and can barely warm...